"[There are] metabolic costs [for] multitasking, such as reading e-mail and talking on the phone at..."

“[There are] metabolic costs [for] multitasking, such as reading e-mail and talking on the phone at the same time, or social networking while reading a book. It takes more energy to shift your attention from task to task. It takes less energy to focus. That means that people who organize their time in a way that allows them to focus are not only going to get more done, but they’ll be less tired and less neurochemically depleted after doing it. Daydreaming also takes less energy than multitask...